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2048_Fall09_Exam1 - 77777 77777 Instructor(s Mueller/Saab...

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77777 77777 Instructor(s): Mueller/Saab PHYSICS DEPARTMENT PHY 2048 Exam 1 September 29, 2009 Name (print, last first): Signature: On my honor, I have neither given nor received unauthorized aid on this examination. YOUR TEST NUMBER IS THE 5-DIGIT NUMBER AT THE TOP OF EACH PAGE. (1) Code your test number on your answer sheet (use lines 76–80 on the answer sheet for the 5-digit number) . Code your name on your answer sheet. DARKEN CIRCLES COMPLETELY . Code your UFID number on your answer sheet. (2) Print your name on this sheet and sign it also. (3) Do all scratch work anywhere on this exam that you like. Circle your answers on the test form. At the end of the test, this exam printout is to be turned in. No credit will be given without both answer sheet and printout. (4) Blacken the circle of your intended answer completely, using a #2 pencil or blue or black ink . Do not make any stray marks or some answers may be counted as incorrect. (5) Hand in the answer sheet separately. Where needed use g = 9 . 80 m/s 2 1. Two girders are made of the same material. Girder A is twice as long as girder B and has a cross-sectional area that is twice as great. The ratio of the mass density of girder A to the mass density of girder B is: (1) 1 (2) 2 (3) 4 (4) 1/2 (5) 1/4 2. A particle moves along the x axis from x i to x f . Of the following values of the initial and final coordinates, which results in the displacement with the largest magnitude? (1) x i = - 4 m, x f = 4 m (2) x i = 4 m, x f = 6 m (3) x i = - 4 m, x f = - 8 m (4) x i = - 4 m, x f = 2 m (5) x i = 4 m, x f = - 2 m 3. A car travels 40 kilometers at a constant speed of 80 km/h and then travels 60 kilometers at a constant speed of 40 km/h. The average speed of the car for this 100-km trip is:
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